Metabolic rate

Definition

Metabolic rate is the amount of energy expended by the body per unit time, often measured in calories or joules. It reflects the energy required to maintain basic bodily functions and support physical activity.

5 Must Know Facts For Your Next Test

1. Metabolic rate is influenced by factors such as age, sex, genetics, and body composition.
2. Basal Metabolic Rate (BMR) is the energy expended while at rest in a neutral temperature environment.
3. The unit typically used for metabolic rate in physics contexts is watts (W), where 1 W = 1 J/s.
4. Physical activity significantly increases metabolic rate above the BMR.
5. Energy expenditure can be calculated using the formula: $E = P \times t$, where $E$ is energy, $P$ is power (metabolic rate), and $t$ is time.

Review Questions

• What factors influence an individual's metabolic rate?
• How does physical activity affect metabolic rate compared to Basal Metabolic Rate (BMR)?
• What formula would you use to calculate energy expenditure from metabolic rate?

Related terms

Basal Metabolic Rate (BMR):

The number of calories required to keep your body functioning at rest.

Calorie: A unit of energy; commonly used to quantify food energy and human metabolism.

Joule:

$\text{SI}$ unit of work or energy, defined as the amount of work done when a force of one newton displaces an object one meter.